Abstract:
This paper presents a study on the transient response of powertrain systems at the lowest mode of
torsional vibration (driveline shuffle). The response can result in gear impacts in the transmission
and driveline (driveline clunk). A powertrain system dynamic model is developed for an automatic
transmission fitted passenger vehicle. The model used in numerical simulations is a stiff system
with strong non-linear elements. In these simulations; damping of the lowest mode was found to
reduce multiple impacts of driveline clunk, reducing the transmitted engine harmonics such as is the
effect of a torque converter had little impact on clunk, increasing the lash was found to reduce the
occurrence of multiple clunks.
